class Solution:
    def threeSum(self, nums: List[int]) -> List[List[int]]:
        res = []
        nums.sort()
        for i in range(len(nums)-2):
            if i>0 and nums[i] == nums[i-1]:
                continue
            l,r = i+1,len(nums)-1
            while l < r:
                s = nums[i] + nums[l] + nums[r]
                if s<0: l+=1
                elif s>0: r-=1
                else:
                    res.append((nums[i],nums[l],nums[r]))
                    while l<r and nums[l] == nums[l+1]:
                        l+=1
                    while l<r and nums[r] == nums[r-1]:
                        r-=1
                    l+=1;r-=1
        return res